diff --git a/public/assets/js/ui-editor.js b/public/assets/js/ui-editor.js
index 0821a9a..5100676 100644
--- a/public/assets/js/ui-editor.js
+++ b/public/assets/js/ui-editor.js
@@ -33,6 +33,7 @@ export function initEditor() {
   const btnUnsavedCancel = document.getElementById('btn-unsaved-cancel');
   const btnUnsavedDiscard = document.getElementById('btn-unsaved-discard');
   const btnUnsavedSave = document.getElementById('btn-unsaved-save');
+  const btnActivateVersion = document.getElementById('btn-activate-version');
   const btnDeactivateVersion = document.getElementById('btn-deactivate-version');
   const activateDialog = document.getElementById('activateVersionDialog');
   const btnActivateCancel = document.getElementById('btn-activate-cancel');
@@ -102,6 +103,7 @@ export function initEditor() {
   function setVersionUiVisible(show) {
     if (versionSelect) versionSelect.classList.toggle('hidden', !show);
     // restore button removed
+    if (btnActivateVersion) btnActivateVersion.classList.toggle('hidden', !show);
     if (btnDeactivateVersion) btnDeactivateVersion.classList.toggle('hidden', !show);
   }
 
@@ -305,6 +307,10 @@ export function initEditor() {
       const isActive = !!(currentVersionMeta && Number(currentVersionMeta.is_active) === 1);
       btnDeactivateVersion.classList.toggle('hidden', !isActive);
     }
+    if (btnActivateVersion) {
+      const isActive = !!(currentVersionMeta && Number(currentVersionMeta.is_active) === 1);
+      btnActivateVersion.classList.toggle('hidden', isActive || !currentVersionId);
+    }
   }
 
   function renderVersionOptions(items) {
@@ -1012,6 +1018,17 @@ export function initEditor() {
   btnCancelSend&& (btnCancelSend.onclick= closeSend);
   sendForm     && (sendForm.onsubmit    = doSend);
   editorSelect && (editorSelect.onchange = () => switchEditor(editorSelect.value));
+  btnActivateVersion && (btnActivateVersion.onclick = async () => {
+    if (!current?.id || !currentVersionId) return;
+    try {
+      const res = await apiAction('content_versions.activate', { method: 'POST', data: { id: currentVersionId } });
+      if (!res?.ok) throw new Error(res?.error || 'Aktivieren fehlgeschlagen');
+      await loadVersionsForCurrent();
+      toast('Version aktiviert', true);
+    } catch (e) {
+      err(e.message || 'Aktivieren fehlgeschlagen');
+    }
+  });
   btnDeactivateVersion && (btnDeactivateVersion.onclick = async () => {
     if (!current?.id) return;
     if (!currentVersionMeta || Number(currentVersionMeta.is_active) !== 1) return;
diff --git a/public/index.php b/public/index.php
index 7d1b0ee..7c747c9 100644
--- a/public/index.php
+++ b/public/index.php
@@ -62,6 +62,7 @@ require __DIR__ . '/../partials/structure/layout_start.php';
         <select id="versionSelect" class="input h-8 py-0 text-sm min-w-[200px]">
           <option value="">Letzte Versionen</option>
         </select>
+        <button id="btn-activate-version" type="button" class="btn">Aktiv setzen</button>
         <button id="btn-deactivate-version" type="button" class="btn">Aktiv deaktivieren</button>
         <button id="btn-clear-main" type="button" class="btn" title="Leeren">🧹</button>
         <button id="btn-preview" type="button" class="btn">Vorschau</button>